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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5e405c59a516100d0d3346c838061a8d0bb23f1e0f4b71b1fc5153c1ddc7a41' 
  AND token = 'N5AmDW6BeN5O1gnX4SVFGg3av5HTcE9Wimv6OcSTigk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}